--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, Xmake Open Source Community.
--
-- @author      jinke18
-- @file        find_emrun.lua
--

-- imports
import("lib.detect.find_program")
import("lib.detect.find_programver")
import("detect.sdks.find_emsdk")

-- find emrun
--
-- @param opt   the argument options, e.g. {version = true}
--
-- @return      program, version
--
-- @code
--
-- local emrun = find_emrun()
-- local emrun, version = find_emrun({version = true})
--
-- @endcode
--
function main(opt)

    -- init options
    opt = opt or {}
    opt.check = opt.check or function (program)
        os.runv(program, {"--help"}, {envs = opt.envs})
    end

    -- init the search directories
    local emsdk = find_emsdk()
    if emsdk and emsdk.emscripten then
        local paths = {}
        table.insert(paths, emsdk.emscripten)
        opt.paths = paths
    end

    -- find program
    -- emsdk 6.0.0+ ships .exe on windows, older releases ship .bat
    local program
    if opt.program then
        program = find_program(opt.program, opt)
    else
        local candidate_names
        if is_host("windows") then
            candidate_names = {"emrun.exe", "emrun.bat"}
        else
            candidate_names = {"emrun"}
        end
        for _, name in ipairs(candidate_names) do
            program = find_program(name, opt)
            if program then
                break
            end
        end
    end

    -- find program version
    local version = nil
    if program and opt and opt.version then
        version = find_programver(program, opt)
    end
    return program, version
end